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From: Bilskis, Patricia A. [ mailto:Patricia.Bilskis@alcoa.com ]
Sent: Thursday, September 26, 2013 11:23 AM
To: Putney, David Subject: RE: FW: TF data from primary aluminum facilities

DavidAttached you will find a spreadsheet that contains Intalco potline primary and secondary control devic e total fluoride data, in lb TF/ton Al units. Please let m e know if you have any questions concerning this da ta.

Thanks much!
Patricia Bilskis Environmental Specialist Intalco Aluminum Corporation Ferndale WA, 98248

Office: 360-384-7267
Cell: 360-201-3430

From: Putney, David [ mailto:putney.david@epa.gov ] Sent: Monday, September 16, 2013 8:32 AM
To: Van Der Meyden, Henk; Bilskis, Patricia A.; Rufa, Nathan P.; Bruntz, Samuel H.; Dorey, Garr E. Cc: Palazzolo, Michael A. Subject: EXT: FW: TF data from primary aluminum facilities

Hello all (again),

My apologies, I realize that I should have been mor e specific. What I am looking for is TF emissions (primary and secondary) from the potlines. Emission s from the carbon bake are low and probably not significantly impacting the risk estimates and TF e missions are not expected from the paste plant.

Thanks,

David Putney, Environmental Engineer U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Sector Policies and Programs Division 109 T.W. Alexander Drive, RTP, NC 27711 Mail Drop D243-02 Ph: (919) 541-2016 Fax: (919) 541-3207
Email: putney.david@epa.govp. 2 of 2

From: Putney, David
Sent: Monday, September 16, 2013 10:50 AM
To: Van Der Meyden, Henk; 'Bilskis, Patricia A.'; 'Ruf a, Nathan P.'; Bruntz, Samuel H.; 'Dorey, Garr E.' Cc: 'Palazzolo, Michael A.' Subject: TF data from primary aluminum facilities

Hello all,

We (EPA) are finishing up our review of the emissio ns test results you submitted in response to the Information Collection Request (ICR) sent out in Ma rch of 2013. Thank you all so much for the time and effort you dedicated to conducting those tests and submitting the results. The next step in the residual risk analysis is to develop the risk model ing files for your facilities. It is essential that we use the best, most accurate estimates of your facilitie s’ emissions in these files so as to most accuratel y estimate the residual risk from your facilities (i. e., the risk remaining after application of the MAC T standards). Through the 2013 ICR we have obtained r ecent, reliable data for emissions of metals and POM (including speciated PAH).

However, we did not collect TF data via the 2013 IC R. During development of the risk modeling file for the Massena East facility I obtained more recent da ta on TF emissions (thanks very much for that – Nate). The emissions data received for that facilit y indicated TF emissions were significantly lower t han I had expected and allowed me to use a lower TF emi ssion rate in the risk file for that facility. Sinc e TF affects the multipathway risk assessment, the ecolo gical risk assessment, and the acute risk
assessment a reduction in the estimates of emission s of that pollutant can have a significant impact o n the estimate of residual risk associated with your facility.

With that in mind, I am asking for some recent data on TF emissions from your facilities (e.g., from NESHAP compliance reports). If possible, could you please send me some data (a summary table of values cited in NESHAP compliance reports) for a fe w recent, representative TF emission rates for your facilities by COB this Friday (09/20/13)? This data would allow me to avoid using the emission rates allowed under the NESHAP to estimate your TF emissi ons (which would likely overestimate your facilities’ TF emissions and the associated risks).

Thanks so much,

David Putney, Environmental Engineer U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Sector Policies and Programs Division 109 T.W. Alexander Drive, RTP, NC 27711 Mail Drop D243-02 Ph: (919) 541-2016 Fax: (919) 541-3207
Email: putney.david@epa.gov